Jumping fleas can accelerate 50 times faster than the space shuttle.
218
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
Early American humans hunted car-size armadillos and used their shells for houses.
12